video: ti: am335x: Support OF graph

Add support for OF graph parsing. When using OF graph the default
tilcdc_panel_info is used which is the same as defined in Linux.

Signed-off-by: Markus Schneider-Pargmann (TI.com) <msp@baylibre.com>

diff --git a/drivers/video/ti/tilcdc.c b/drivers/video/ti/tilcdc.c
index 340c79299bacabc5a95dbeafbed3cb729afe7576..b498e81864b87464c00c1b23cb1d35394b06d9e8 100644 (file)
--- a/drivers/video/ti/tilcdc.c
+++ b/drivers/video/ti/tilcdc.c
@@ -6,6 +6,7 @@
 #include <clk.h>
 #include <dm.h>
 #include <dm/device_compat.h>
+#include <dm/ofnode_graph.h>
 #include <log.h>
 #include <panel.h>
 #include <video.h>
@@ -113,6 +114,18 @@ struct tilcdc_priv {
 
 DECLARE_GLOBAL_DATA_PTR;
 
+static const struct tilcdc_panel_info tilcdc_panel_info_default = {
+               .ac_bias                = 255,
+               .ac_bias_intrpt         = 0,
+               .dma_burst_sz           = 16,
+               .bpp                    = 16,
+               .fdd                    = 0x80,
+               .tft_alt_mode           = 0,
+               .sync_edge              = 0,
+               .sync_ctrl              = 1,
+               .raster_order           = 0,
+};
+
 static ulong tilcdc_set_pixel_clk_rate(struct udevice *dev, ulong rate)
 {
        struct tilcdc_priv *priv = dev_get_priv(dev);
@@ -173,6 +186,8 @@ static int tilcdc_probe(struct udevice *dev)
        struct udevice *panel, *clk_dev;
        struct tilcdc_panel_info info;
        struct display_timing timing;
+       bool is_legacy_panel = false;
+       ofnode remote;
        ulong rate;
        u32 reg;
        int err;
@@ -181,10 +196,21 @@ static int tilcdc_probe(struct udevice *dev)
        if (!(gd->flags & GD_FLG_RELOC))
                return 0;
 
-       err = uclass_get_device(UCLASS_PANEL, 0, &panel);
-       if (err) {
-               dev_err(dev, "failed to get panel\n");
-               return err;
+       /* Try using remote node first, then fall back to using UCLASS_PANEL */
+       remote = ofnode_graph_get_remote_node(dev_ofnode(dev), -1, -1);
+       if (ofnode_valid(remote)) {
+               err = uclass_get_device_by_ofnode(UCLASS_PANEL, remote, &panel);
+               if (err) {
+                       dev_err(dev, "failed to get panel via OF graph\n");
+                       return err;
+               }
+       } else {
+               err = uclass_get_device(UCLASS_PANEL, 0, &panel);
+               if (err) {
+                       dev_err(dev, "failed to get panel\n");
+                       return err;
+               }
+               is_legacy_panel = true;
        }
 
        err = panel_get_display_timing(panel, &timing);
@@ -205,10 +231,14 @@ static int tilcdc_probe(struct udevice *dev)
        if (timing.vactive.typ > LCDC_MAX_HEIGHT)
                timing.vactive.typ = LCDC_MAX_HEIGHT;
 
-       err = tilcdc_panel_get_display_info(panel, &info);
-       if (err) {
-               dev_err(dev, "failed to get panel info\n");
-               return err;
+       if (is_legacy_panel) {
+               err = tilcdc_panel_get_display_info(panel, &info);
+               if (err) {
+                       dev_err(dev, "failed to get panel info\n");
+                       return err;
+               }
+       } else {
+               info = tilcdc_panel_info_default;
        }
 
        switch (info.bpp) {